Different Effect Of Light And Nutrient Availability On The Fitness Of Galeopsis Bifida

The strategy on the seed reproduction can be partly presented by the control of seed size and number.First we come up with a hypothesis that there is a upper and lower limit for every single seed plant and this limit can alter in certain area.We hereby create a mathematic model based on this hypothesis, in which we come up with a possisibility that plant may strike a change between seed size and number under the condition of different recources level. We hereby observe and carry out the research on Galeopsis biffda under the condition of different recources level. and test our mathematic model through comparison with experiment result, then, we discover the plant physiology mechanism and plant reproduction strategy under the condition of different resource level.Our model and experiment mainly about: 1, We hypothesis that there is a upper and lower limit for every single seed plant by the analysis of the relationship between plant seed size and fitness.2, We create a mathematic model based on our hypothesis and predict that the seed number range will change under the condition of different recources level.Seed number and seed size will get a inverse ratio relationship.3, The model predict that plant maintains seed size while reducing seed number by means of resource reduction.4, We prove our model predict by experiment which take Galeopsis bifida as experiment material, observe the change of seed number and seed size under the condition of different recources level.5, The experiment will be carried out in different light and N nutrition resource condition The method of resource amount control light resorce will take the way of setting artificial shade during the sunlight.There will be two different artificial shade group which are 40%artificial and full sunlight.The method of resource amount control N nutrition resource will take the way of setting two different nitrogen nutrition levels.All experiments will be carried out in the way of cross experiment.6, The result shows that the seed size of Galeopsis bifida remain unchanged while seed number reduce rapidly under the condition of different N resource levels but not light resource treat; Galeopsis bifida maintain the offspring fitness by reducing the seed number and keeping the seed size despite of limited resource.